linux-toradex.git/include/linux/memblock.h, branch v4.11-rc3

memblock: embed memblock type name within struct memblock_type

2017-02-25T01:46:54+00:00

Provide the name of each memblock type with struct memblock_type.  This
allows to get rid of the function memblock_type_name() and duplicating
the type names in __memblock_dump_all().

The only memblock_type usage out of mm/memblock.c seems to be
arch/s390/kernel/crash_dump.c.  While at it, give it a name.

Link: http://lkml.kernel.org/r/20170120123456.46508-4-heiko.carstens@de.ibm.com
Signed-off-by: Heiko Carstens 
Cc: Philipp Hachtmann 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm: page_alloc: skip over regions of invalid pfns where possible

2017-02-23T00:41:29+00:00

When using a sparse memory model memmap_init_zone() when invoked with
the MEMMAP_EARLY context will skip over pages which aren't valid - ie.
which aren't in a populated region of the sparse memory map.  However if
the memory map is extremely sparse then it can spend a long time
linearly checking each PFN in a large non-populated region of the memory
map & skipping it in turn.

When CONFIG_HAVE_MEMBLOCK_NODE_MAP is enabled, we have sufficient
information to quickly discover the next valid PFN given an invalid one
by searching through the list of memory regions & skipping forwards to
the first PFN covered by the memory region to the right of the
non-populated region.  Implement this in order to speed up
memmap_init_zone() for systems with extremely sparse memory maps.

James said "I have tested this patch on a virtual model of a Samurai CPU
with a sparse memory map.  The kernel boot time drops from 109 to
62 seconds. "

Link: http://lkml.kernel.org/r/20161125185518.29885-1-paul.burton@imgtec.com
Signed-off-by: Paul Burton 
Tested-by: James Hartley 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/memblock.c: expose total reserved memory

2016-10-08T01:46:28+00:00

The total reserved memory in a system is accounted but not available for
use use outside mm/memblock.c.  By exposing the total reserved memory,
systems can better calculate the size of large hashes.

Link: http://lkml.kernel.org/r/1472476010-4709-3-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Srikar Dronamraju 
Suggested-by: Mel Gorman 
Cc: Vlastimil Babka 
Cc: Michal Hocko 
Cc: Michael Ellerman 
Cc: Mahesh Salgaonkar 
Cc: Hari Bathini 
Cc: Dave Hansen 
Cc: Balbir Singh 
Cc: Benjamin Herrenschmidt 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/memblock.c: add new infrastructure to address the mem limit issue

2016-07-28T23:07:41+00:00

In some cases, memblock is queried by kernel to determine whether a
specified address is RAM or not.  For example, the ACPI core needs this
information to determine which attributes to use when mapping ACPI
regions(acpi_os_ioremap).  Use of incorrect memory types can result in
faults, data corruption, or other issues.

Removing memory with memblock_enforce_memory_limit() throws away this
information, and so a kernel booted with 'mem=' may suffer from the
issues described above.  To avoid this, we need to keep those NOMAP
regions instead of removing all above the limit, which preserves the
information we need while preventing other use of those regions.

This patch adds new infrastructure to retain all NOMAP memblock regions
while removing others, to cater for this.

Link: http://lkml.kernel.org/r/1468475036-5852-2-git-send-email-dennis.chen@arm.com
Signed-off-by: Dennis Chen 
Acked-by: Steve Capper 
Cc: Catalin Marinas 
Cc: Ard Biesheuvel 
Cc: Pekka Enberg 
Cc: Mel Gorman 
Cc: Tang Chen 
Cc: Tony Luck 
Cc: Ingo Molnar 
Cc: Rafael J. Wysocki 
Cc: Will Deacon 
Cc: Mark Rutland 
Cc: Matt Fleming 
Cc: Kaly Xin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/memblock.h: Clean up code for several trivial details

2016-07-26T23:19:19+00:00

Correct the function parameters alignment, since original code already
use both tabs and white spaces together for the incorrect parameters
alignment functions.

If one line can hold one statement within 80 columns, let it in one line
(original code did not consider about the tabs/spaces for 2nd line when
a statement is separated into 2 lines).

Try to let '' aligned within one macro, since all related lines are
short enough.

Remove useless statement "idx = 0;", and always assign rgn within the
'for' statement.

Link: http://lkml.kernel.org/r/1464904899-1714-1-git-send-email-chengang@emindsoft.com.cn
Signed-off-by: Chen Gang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

memblock: fix section mismatch

2016-01-16T01:56:32+00:00

allmodconfig produces following warning for me:

  WARNING: vmlinux.o(.text.unlikely+0x10314): Section mismatch in reference from the function movable_node_is_enabled() to the variable .meminit.data:movable_node_enabled
  The function movable_node_is_enabled() references
  the variable __meminitdata movable_node_enabled.
  This is often because movable_node_is_enabled lacks a __meminitdata
  annotation or the annotation of movable_node_enabled is wrong.

Let's mark the function with __meminit.  It fixes the warning.

Signed-off-by: Kirill A. Shutemov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

include/linux/memblock.h: fix ordering of 'flags' argument in comments

2016-01-15T00:00:49+00:00

for_each_free_mem_range() and for_each_free_mem_range_reverse() both
accept a 'flags' argument, the comment surrounding the macro placed the
'flags' documentation at the very end, while 'flags' is in fact the 3rd
argument to the macro, so let's preserve natural ordering here.

Fixes: fc6daaf931518 ("mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute")
Signed-off-by: Florian Fainelli 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/memblock: introduce for_each_memblock_type()

2016-01-15T00:00:49+00:00

We already have the for_each_memblock() macro in 
which provides ability to iterate over memblock regions of a known type.
The for_each_memblock() macro allows us to pass the pointer to the
struct memblock_type, instead we need to pass name of the type.

This patch introduces a new macro for_each_memblock_type() which allows
us iterate over memblock regions with the given type when the type is
unknown.

Signed-off-by: Alexander Kuleshov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/memblock.c: memblock_is_memory()/reserved() can be boolean

2016-01-15T00:00:49+00:00

Make memblock_is_memory() and memblock_is_reserved return bool to
improve readability due to these particular functions only using either
one or zero as their return value.

No functional change.

Signed-off-by: Yaowei Bai 
Acked-by: Michal Hocko 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

mm/memblock: add MEMBLOCK_NOMAP attribute to memblock memory table

2015-12-09T16:56:58+00:00

This introduces the MEMBLOCK_NOMAP attribute and the required plumbing
to make it usable as an indicator that some parts of normal memory
should not be covered by the kernel direct mapping. It is up to the
arch to actually honor the attribute when laying out this mapping,
but the memblock code itself is modified to disregard these regions
for allocations and other general use.

Cc: linux-mm@kvack.org
Cc: Alexander Kuleshov 
Cc: Andrew Morton 
Reviewed-by: Matt Fleming 
Signed-off-by: Ard Biesheuvel 
Signed-off-by: Will Deacon